Units
Units
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Physics
Units
All units are spelled out using lower case, e.g. joules, volts, kilogram.
Symbols of unitsthat derive from the name of a physicist are all uppercase e.g. J, V etc. while symbols for all other units remain lowercase, e.g. the symbol for the kilogram is kg.
Check that you know these by covering over all but the first column.
Let me know if I’ve missed any.
Mechanics
Quantity |
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Symbol |
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Unit |
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Symbol |
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Equation |
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Area |
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a |
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metres squared |
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m2 |
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Volume |
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v |
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metres cubed |
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m3 |
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Mass |
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m |
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kilogram |
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kg |
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Density |
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r |
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kilogram per metre cubed |
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kg m-3 |
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r = m/v |
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Displacement |
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s |
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metre |
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m |
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Velocity |
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v |
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metre per second |
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m s-1 |
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v = d/t |
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Acceleration |
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a |
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metre per second squared |
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m s-2 |
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Force |
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f |
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newton |
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N |
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F = ma |
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Momentum |
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r |
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kg m s-1 |
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r = mv |
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Pressure |
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p |
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pascal |
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Pa |
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p = F/a |
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Moment of a force |
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newton metre |
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N m |
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Torque (couple) |
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T |
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newton metre |
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N m |
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T = F x d |
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Energy |
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E / Q / W |
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joule |
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J |
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Work |
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W |
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joule |
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J |
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W = F s |
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Power |
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P |
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Watt |
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W |
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P = W/t |
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Angle |
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q (“theta”) |
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radian |
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rad |
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Angular velocity |
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w (“omega”) |
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radian per second |
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rad/sec |
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w = q/t |
Heat and Temperature
Quantity |
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Symbol |
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Unit |
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Symbol |
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Equation |
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Heat Capacity |
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C |
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joule per kelvin |
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J/K |
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Q = c (rq) |
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Specific Heat Capacity |
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c |
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J/kg/K |
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Q = mcrq |
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Latent Heat |
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l |
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joule per kilogram |
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J/kg |
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Q = ml |
Waves, Sound and Light
Quantity |
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Symbol |
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Unit |
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Symbol |
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Equation |
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Frequency |
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f |
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hertz |
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Hz |
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Wavelength |
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l (“lamda”) |
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metres |
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m |
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Velocity |
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v (or c for light) |
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metre per second |
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m/s |
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v = f l |
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Intensity |
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I |
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watts per metre squared |
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W/m2 |
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S.I. = P/A |
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Sound Intensity Level |
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decibels |
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dB |
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Electricity
Quantity |
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Symbol |
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Unit |
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Symbol |
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Equation |
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Charge |
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Q |
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coulomb |
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C |
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Electric Field Strength |
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E |
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newtons per coulomb |
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N/C |
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E = F/Q |
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Potential Difference |
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V |
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volts |
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V |
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W = V Q |
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Capacitance |
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C |
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farads |
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F |
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C = Q/V |
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Current |
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I |
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amperes (amps) |
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A |
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I = Q/t |
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Power |
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P |
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watt |
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W |
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P = VI |
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Resistance |
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R |
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ohm |
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Ω |
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R = V/I |
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Resistivity |
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r |
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ohm-metre |
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Ω m |
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r = RA /l |
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Magnetic Flux Density |
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B |
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tesla |
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T |
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F = BIL |
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Magnetic Flux |
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f Psi (“sigh”) |
|
weber |
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W |
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f = BA |
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Half-Life |
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T1/2 |
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second |
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T1/2 = 0.693/l |
Source : http://www.thephysicsteacher.ie/LC%20Physics/Revision/1.%20Units.doc
Web site link: http://www.thephysicsteacher.ie
Author : not indicated on the source document of the above text
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Units
Units
Units
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Units physics notes
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